| Active principles | Rating | Bibliogr. | Expand | |
|---|---|---|---|---|
| 1 | Carbon Radioisotopes | 100 | + | |
| 2 | Tritium | 90 | + | |
| 3 | Xenon Radioisotopes | 77 | + | |
| 4 | Iodine Radioisotopes | 60 | + | |
| 5 | Oxygen Radioisotopes | 42 | + | |
| 6 | Radioactive Tracers | 17 | + | |
| 7 | Fluorine Radioisotopes | 11 | + | |
| 8 | Cerium Radioisotopes | 5 | + | |
| 9 | Calcium Radioisotopes | 3 | + | |
| 10 | Cobalt Radioisotopes | 2 | + |